This all depends on what you're looking into applying. In my area, you aren't required to have a license if you aren't applying commercial chemicals. So anything you can purchase without a license, you can apply. I get all my chemicals (fertilizers, weed control, etc.) from Home Depot and farm supply stores. I can make my clients lawns look just as good for half the price as some of the other commercial applicator businesses. I have had people argue with me over the requirement for "applicator licenses" but I have spoken to the local USDA offices and the Extension office on several occasions and have been assured by both.